<template>
    <div class="app-container">
        <!-- 顶部 Header 区域 -->
        <mt-header fixed title="咸鱼资讯-最闲的鱼"></mt-header>
        <p class="back" @click="menuBack" v-show="flag">
            返回
        </p>


        <!-- 中间router 区域 -->
        <transition>
            <router-view></router-view>
        </transition>
        
        <!-- 底部Tabbar 区域  -->
        <nav class="mui-bar mui-bar-tab">
            <router-link class="mui-tab-itema" to="/home">
                <span class="mui-icon mui-icon-home"></span>
                <span class="mui-tab-label">首页</span>
            </router-link>
            <router-link class="mui-tab-itema" to="/member">
                <span class="mui-icon mui-icon-contact"></span>
                <span class="mui-tab-label">会员</span>
            </router-link>
            <router-link class="mui-tab-itema" to="/shopcar">
                <span class="mui-icon mui-icon-extra mui-icon-extra-cart">
                    <span class="mui-badge" id="badge">{{ this.$store.getters.getAllCount }}</span>
                </span>
                <span class="mui-tab-label">购物车</span>
            </router-link>
            <router-link class="mui-tab-itema" to="/search">
                <span class="mui-icon mui-icon-search"></span>
                <span class="mui-tab-label">搜索</span>
            </router-link>
        </nav>
    </div>
</template>

<script>
    export default {
        data(){
            return {
                flag: true
            }
        },
        created(){
            this.flag = this.$route.path === '/home'?false:true   // 三元表达式判断 是否进入时候为首页，是的话不显示返回，不是的话显示返回
        },
        methods:{
            menuBack(){
               this.$router.go(-1)
            }   
        },
        watch: {
            '$route.path':function (newVal) {  
                if(newVal === '/home'){
                    this.flag = false
                }else{
                    this.flag = true
                }
            }
        }
    }
</script>

<style lang="scss" scoped>
 .mint-header{
    z-index: 999;
 }
.app-container{
    position: relative;
    padding-top: 40px;
    padding-bottom: 50px;
    overflow-x: hidden;
    .back{
        position: fixed;
        z-index: 9991;
        left: 8%;
        top: 1.6%;
        color: #fff;
        &:before{
            content:"";
            position: absolute;
            z-index: 9999;
            left: -40%;
            top: 25%;
            padding: 4px;
            border-left: 2px solid #fff;
            border-bottom: 2px solid #fff;            
            transform: rotate(45deg)
        }
    }
}

.v-enter {
    opacity: 0;
    transform: translateX(100%);
}
.v-leave-to{
    opacity: 0;
    transform: translateX(-100%);
    position: absolute;
}
.v-enter-active, .v-leave-active{
    transition: all 0.5s ease;
}
/* 改类名，解决 tabbar 点击无法切换的问题 */
.mui-bar-tab .mui-tab-itema.mui-active {
    color: #007aff;
}
.mui-bar-tab .mui-tab-itema {
    display: table-cell;
    overflow: hidden;
    width: 1%;
    height: 50px;
    text-align: center;
    vertical-align: middle;
    white-space: nowrap;
    text-overflow: ellipsis;
    color: #929292;
}
.mui-bar-tab .mui-tab-itema .mui-icon {
    top: 3px;
    width: 24px;
    height: 24px;
    padding-top: 0;
    padding-bottom: 0;
}
.mui-bar-tab .mui-tab-itema .mui-icon~.mui-tab-label {
    font-size: 11px;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
}
</style>